Hamilton's Rule Framework
Altruism Evolves
Hamilton's rule is a mathematical formula that predicts when altruism will evolve in a population. It states that altruism will evolve when the cost to the actor is less than the benefit to the recipient, multiplied by the probability that the recipient carries a copy of the gene for altruism. This framework helps explain the evolution of cooperation and altruism in humans and other animals.
- Altruism evolves when the cost to the actor is less than the benefit to the recipient, multiplied by the probability that the recipient carries a copy of the gene for altruism.
- Kin selection is a key driver of the evolution of altruism.
- The degree of genetic relatedness between individuals affects the likelihood of altruism.
- Calculate the cost to the actorDetermine the cost to the individual performing the altruistic act.Pro tipConsider the potential risks and benefits to the actor.WarningFailure to accurately calculate the cost may lead to incorrect predictions.
- Calculate the benefit to the recipientDetermine the benefit to the individual receiving the altruistic act.Pro tipConsider the potential benefits to the recipient, including increased survival and reproduction.WarningFailure to accurately calculate the benefit may lead to incorrect predictions.
- Calculate the probability of genetic relatednessDetermine the probability that the recipient carries a copy of the gene for altruism.Pro tipConsider the degree of genetic relatedness between the actor and recipient.WarningFailure to accurately calculate the probability may lead to incorrect predictions.
- Apply Hamilton's ruleUse the calculated values to determine whether altruism will evolve.Pro tipIf the cost to the actor is less than the benefit to the recipient, multiplied by the probability of genetic relatedness, then altruism will evolve.WarningFailure to apply the rule correctly may lead to incorrect predictions.
Ground squirrels will give alarm calls to warn other squirrels of predators, even if it puts them at risk. This behavior can be explained by Hamilton's rule, as the benefit to the recipient (increased survival) is greater than the cost to the actor (increased risk of predation).
Humans will often engage in altruistic behaviors, such as donating to charity or helping a stranger in need. This behavior can be explained by Hamilton's rule, as the benefit to the recipient (increased well-being) is greater than the cost to the actor (time, money, or effort).
Hamilton's rule was first proposed by W.D. Hamilton in 1964 as a way to explain the evolution of altruism in insects. It has since been applied to a wide range of species, including humans, and has become a fundamental concept in evolutionary psychology.